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The IIS 10.0 website must be configured to limit the maxURL.


Overview

Finding ID Version Rule ID IA Controls Severity
V-218753 IIST-SI-000225 SV-218753r558649_rule Medium
Description
Request filtering replaces URLScan in IIS, enabling administrators to create a more granular rule set with which to allow or reject inbound web content. By setting limits on web requests, it helps to ensure availability of web services and may also help mitigate the risk of buffer overflow type attacks. The MaxURL Request Filter limits the number of bytes the server will accept in a URL.
STIG Date
Microsoft IIS 10.0 Site Security Technical Implementation Guide 2022-06-23

Details

Check Text ( C-20226r311157_chk )
Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click on the site name.

Double-click the "Request Filtering" icon.

Click "Edit Feature Settings" in the "Actions" pane.

If the "maxUrl" value is not set to "4096" or less, this is a finding.
Fix Text (F-20224r311158_fix)
Follow the procedures below for each site hosted on the IIS 10.0 web server:

Click the site name under review.

Double-click the "Request Filtering" icon.

Click "Edit Feature Settings" in the "Actions" pane.

Set the "maxURL" value to "4096" or less.